import java.util.TreeSet;


public class Test {
	public static void main(String[] args) {
		System.out.println("A".compareTo("Z"));
		System.out.println("Z".compareTo("K"));
		TreeSet t=new TreeSet();
		t.add(10);
		t.add(15);
		t.add(0);
		System.out.println(t);
	}

}
